Author Topic: 660 muffler mod  (Read 517 times)

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Offline 660magnum

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Re: 660 muffler mod
« on: May 06, 2014, 08:22:18 pm »
I tested a stock dp cover and a little more opened dp muffler cover without seeing any gains.  Oh I did have the side exhaust outlet already opened as big as the deflector instead of the  little hole they put out now days on the stock 660. So that could have made the difference in that cover test.
Yes and that muffler works good too.
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